DIODES AP64500QSP-EVM Buck Converter User Guide

DIODES AP64500QSP-EVM Buck Converter

Specifications

• Model: AP64500QSP-EVM
• Type: Automotive-compliant synchronous Buck Converter
• Input Voltage Range: 3.8V to 40V
• Output Current : 5A
• Switching Frequency: Programmable from 100kHz to 2.2MHz
• Efficiency: Up to 85% at 5mA Light Load
• Package : SO-8EP

Product Usage Instructions

Quick Start Guide

The AP64500QSP-EVM is a simple evaluation board that allows easy access to the signals for testing. To evaluate the performance of the AP64500QSP, follow these steps:

1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and the negative terminal to GND.
3. For Enable functionality, place a jumper at JH6 in the ON position to connect the EN pin to VIN through a 100K resistor or leave it OPEN. Jump to the OFF position to disable the IC.
4. The evaluation board should now power up with a 5.0V output voltage.

FAQ

• What is the input voltage range of the AP64500Q?
  The AP64500Q has an input voltage range of 3.8V to 40V.

• What is the maximum output current supported by the AP64500Q?
  The AP64500Q supports a maximum output current of 5A.

• How can I enable or disable the IC on the evaluation board?
  To enable the IC, place a jumper at JH6 in the ON position to connect the EN pin to VIN through a 100K resistor or leave it OPEN. Jump to the OFF position to disable the IC.

DESCRIPTION

he AP64500Q is an automotive-compliant, 5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 45mΩ high-side power MOSFET and a 20mΩ low-side power MOSFET to provide high- efficiency step-down DC-DC conversion.

• The AP64500Q device is easily used by minimizing the external component count due to its adoption of peak current mode control.
• The AP64500Q design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which

reduces high-frequency radiated EMI noise caused by MOSFET switching. The AP64500Q also features a Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period. he device is available in the SO-8EP package.

FEATURES

• EC-Q100 Qualified with the Following Results
  • Device Temperature Grade 1: -40°C to+125°C TA Range
  • Device HBM ESD Classification LevelH2
  • Device CDM ESD Classification LevelC5
• VIN: 3.8V to 40V
• 5A Continuous Output Current
• 0.8V ±1% Reference Voltage
• 25μA Ultralow Quiescent Current (Pulse Frequency Modulation)
• Programmable Switching Frequency: 100kHz to2.2MHz
• External Clock Synchronization: 100kHz to2.2MHz
• Up to 85% Efficiency at 5mA Light Load
• Proprietary Gate Driver Design for Best EMIReduction
• Frequency Spread Spectrum (FSS) to ReduceEMI
• Low-Dropout (LDO) Mode
• Precision Enable Threshold to adjust UVLO
• Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” D

TYPICAL APPLICATIONS CIRCUIT

ABSOLUTE MAXIMUM RATINGS

-0.3 to +45.0 (400ms)
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +42.0| V
VRT/CLK| RT/CLK Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Voltage| -0.3V to +6.0| V
VCOMP| Compensation Pin Voltage| -0.3 to +6.0| V
VSW| Switch Node Voltage| -0.3 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP64500QSP-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP64500QSP, follow the procedure below:

1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, to enable IC, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ resistor or leave it OPEN. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 5.0V output voltage.
5. Check for the proper output voltage of 5.0V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND.
6. Set the load to 5A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.

MEASUREMENT/PERFORMANCE GUIDELINES

1. When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
2. For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current.

SETTING OUTPUT VOLTAGE

Table 1 shows a list of recommended component selections for common output voltages.

VOUT| R1| R2| L1| R7| C7| C1, C2| C5, C6, C13
---|---|---|---|---|---|---|---
1.2V| 4.99KΩ| 10KΩ| 1.5µH| 3.74KΩ| 2.7nF| 2×10µF| 3×22µF
1.5V| 8.66KΩ| 10KΩ| 2.2µH| 4.75KΩ| 2.7nF| 2×10µF| 3×22µF
1.8V| 12.4KΩ| 10KΩ| 2.2µH| 5.62KΩ| 2.7nF| 2×10µF| 3×22µF
2.5V| 21.5KΩ| 10KΩ| 3.3µH| 7.87KΩ| 2.7nF| 2×10µF| 3×22µF
3.3V| 31.6KΩ| 10KΩ| 3.3µH| 10.5KΩ| 2.7nF| 2×10µF| 3×22µF
5.0V| 52.3KΩ| 10KΩ| 4.7µH| 15.8KΩ| 2.7nF| 2×10µF| 3×22µF
12V| 140KΩ| 10KΩ| 10µH| 37.4KΩ| 2.7nF| 2×10µF| 3×22µF

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

AUTOMOTIVE BILL OF MATERIALS for AP64500QSP-EVM @VOUT=5V

Ref

| ****

Value

| ****

Description

| ****

Qty

| ****

Size

| ****

Vendor Name

| ****

Manufacturer PN

---|---|---|---|---|---|---
C1, C2| 10µF| Ceramic Capacitor, 50V| 2| 1206| TDK| CGA5L1X7R1H106K160AC
C3, C4, C9| 0.1µF| Ceramic Capacitor, 50V| 3| 0603| TDK| CGA3E3X8R1H104K080AB
C5, C6, C13| 22µF| Ceramic Capacitor, 16V| 3| 1210| TDK| CGA6P1X8L1C226M250AC
C7| 2.7nF| Ceramic Capacitor,

50V

| 1| 0603| TDK| ****

CGA3E2NP01H272J080AA

R1| 52.3KΩ| RES SMD| 1| 0603| Panasonic| ERJ-3EKF5232V
R2| 10KΩ| RES SMD| 1| 0603| Panasonic| ERJ-3EKF1002V
R3| 0Ω| RES SMD| 1| 0603| Panasonic| ERJ-3GEY0R00V

R4

| ****

100KΩ

| ****

RES SMD

| ****

1

| ****

0603

| ****

Panasonic

| ****

ERJ-3RBD104V

R6| 200KΩ| RES SMD| 1| 0603| Panasonic| ERJ-S03F2003V
R7| 15.8KΩ| RES SMD| 1| 0603| Panasonic| ERJ-3EKF1582V
L1| 4.7µH| DCR=10.2mΩ, Ir=10.9A| 1| 10.0×10.7x

5.4mm

| Panasonic| ETQ-P5M4R7YFC
JH6| | PCB Header, 36 POS| 1| 1X3| Amphenol| 78511-136HLF
JH13, JH14, JH15,

JH16

| ****

1598

| ****

Terminal Turret Triple 0.094″ L (Test Points)

| ****

4

| ****

Through-Hole

| ****

Keystone Electronics

| ****

1598-2

U1

| AP64500 Q| Sync DC-DC Buck Converter| ****

1

| ****

SO-8EP

| Diodes

Incorporated (Diodes)

| ****

AP64500QSP

TYPICAL PERFORMANCE CHARACTERISTICS

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